Use Form Value To Derive Email Address

I am trying to make a form that will pull the value from the form to send to that specific email address. Please see attached code. So the value from "emailto" needs to somehow be referenced in the form post under the recipients value.

Sorry, I have a form processor now, it is a PHP script from Tectite. It requires the value be fed in through this variable. I want it to send to the email address that is selected when the form is submitted.

emailto is my variable, i need to pass <input name="recipients" value="emailto" type="hidden" /> to the php script in this format ... except it generally wants an actual email address in "value=""". How can i submit a variable that will change when the form is processed and passed?